Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa899baac29a330c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 21:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fce81c70d2783c89ecc0888406d889ab SHA-1: fcea26172f36ed408dd0447225711dd3dfb89105 SHA-256: aa899baac29a330c18fae38579e52d2f50b217caccd48122dde4c2f3e5065bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coluer.ir/documents/file/81988304126.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9079ba11122594beb5c648ecbde778d0/80153483405.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/90379918375.pdfIn PDF document text
    • http://attlas.center/userfiles/file/jivuxafedodefakosasato.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/87674546677.pdfIn PDF document text
    • http://aromata.ru/upload/files/74444103895.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/62269314150.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/juzugokudedimijebitevara.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/77195677514.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/55299359178.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/runajimobigo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613786a240528---kajol.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/seradefamevisoxebuvidilub.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/gijologuvenifujokuk.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/dupijo.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210920_0728475DE96BD958.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109170026254189.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_163123.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16145b9562ec69---zebutagarebalewidija.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef3f3edbe---bokeb.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/42983667414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=samsung+galaxy+active+2+wear+osPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 17632 bytes
SHA-256: fc2bb77da9f97181063fc4cf6151906f14937f164343d7d3ed7774999c8acf7b
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 11236 bytes
SHA-256: 83482981652e2d25bbe4129cc0efcaac46534aa2209fc2f477741b8cd9bfb613
font_02_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1